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https://issues.apache.org/jira/browse/HDFS-6034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE updated HDFS-6034:
-----------------------------------------

    Attachment: h6034_20140228.patch

h6034_20140228.patch: use DataNodeLayoutVersion for DNs and do not verify LV if 
there is rolling upgrade.

> DN registration should use DataNodeLayoutVersion instead of 
> NameNodeLayoutVersion
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-6034
>                 URL: https://issues.apache.org/jira/browse/HDFS-6034
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, ha, hdfs-client, namenode
>    Affects Versions: HDFS-5535 (Rolling upgrades)
>            Reporter: Haohui Mai
>            Assignee: Tsz Wo (Nicholas), SZE
>
> Currently the registrationID is in the form of 
> {{BlockPoolID-NNLayoutVersion}}. When the NN bumps the layout version during 
> rolling upgrade, the DNs will fail to register with the new NN and exit, 
> regardless whether the new software version is used.



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